There is disclosed an electrical device including a battery, and a battery management system. The battery management system includes a controller in electrical communication with a pressure sensor to monitor the state of health of the battery. The controller applies a method for determining the state of health that uses a non-electrical (mechanical) signal of force measurements combined with incremental capacity analysis to estimate the capacity fading and other health indicators of the battery with better precision than existing methods. The pressure sensor may provide the force measurement signal to the controller, which may determine which incremental capacity curve based on force to use for the particular battery. The controller then executes a program utilizing the data from the pressure sensor and the stored incremental capacity curves based on force to estimate the capacity fading and signal a user with the state of health percentage.
Legal claims defining the scope of protection, as filed with the USPTO.
5. The device of claim 1 wherein the sensor is a sensor that measures stress, pressure, or force.
6. The device of claim 1 wherein the sensor is a sensor that measures strain, or displacement.
7. The device of claim 1 wherein the sensor is a sensor that measures any form of physical deformation.
18. The device of claim 16 wherein the state of health or other diagnostic signal is capacity fade.
19. The device of claim 16 wherein the state of health or other diagnostic signal is resistance growth.
20. The device of claim 16 wherein the state of health or other diagnostic signal is expected lifetime signal.
21. The device of claim 16 wherein the state of health or other diagnostic signal is anticipated replacement date.
22. The device of claim 16 wherein the state of health or other diagnostic signal is pre-failure warning.
32. The battery management system of claim 29 wherein taking the derivative of the charge or discharge capacity with respect to force includes first processing data of measured force over the time period of charge or discharge by applying a post processing technique.
36. The battery management system of claim 34 wherein the state of health or other diagnostic signal is capacity fade.
37. The battery management system of claim 34 wherein the state of health or other diagnostic signal is resistance growth.
38. The battery management system of claim 34 wherein the state of health or other diagnostic signal is expected lifetime signal.
39. The battery management system of claim 34 wherein the state of health or other diagnostic signal is anticipated replacement date.
40. The battery management system of claim 34 wherein the state of health or other diagnostic signal is pre-failure warning.
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November 18, 2016
April 11, 2023
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